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69 lines
1.9 KiB
Ruby
69 lines
1.9 KiB
Ruby
require_relative '../../spec_helper'
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describe "Integer#upto [stop] when self and stop are Integers" do
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it "does not yield when stop is less than self" do
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result = []
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5.upto(4) { |x| result << x }
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result.should == []
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end
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it "yields once when stop equals self" do
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result = []
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5.upto(5) { |x| result << x }
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result.should == [5]
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end
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it "yields while increasing self until it is less than stop" do
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result = []
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2.upto(5) { |x| result << x }
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result.should == [2, 3, 4, 5]
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end
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it "yields while increasing self until it is greater than floor of a Float endpoint" do
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result = []
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9.upto(13.3) {|i| result << i}
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-5.upto(-1.3) {|i| result << i}
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result.should == [9,10,11,12,13,-5,-4,-3,-2]
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end
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it "raises an ArgumentError for non-numeric endpoints" do
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-> { 1.upto("A") {|x| p x} }.should raise_error(ArgumentError)
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-> { 1.upto(nil) {|x| p x} }.should raise_error(ArgumentError)
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end
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describe "when no block is given" do
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it "returns an Enumerator" do
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result = []
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enum = 2.upto(5)
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enum.each { |i| result << i }
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result.should == [2, 3, 4, 5]
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end
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describe "returned Enumerator" do
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describe "size" do
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it "raises an ArgumentError for non-numeric endpoints" do
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enum = 1.upto("A")
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-> { enum.size }.should raise_error(ArgumentError)
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enum = 1.upto(nil)
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-> { enum.size }.should raise_error(ArgumentError)
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end
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it "returns stop - self + 1" do
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5.upto(10).size.should == 6
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1.upto(10).size.should == 10
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0.upto(10).size.should == 11
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0.upto(0).size.should == 1
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-5.upto(-3).size.should == 3
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end
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it "returns 0 when stop < self" do
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5.upto(4).size.should == 0
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0.upto(-5).size.should == 0
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-3.upto(-5).size.should == 0
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end
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end
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end
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end
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end
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